族 周期 | ⅠA | 0 | |||||||
1 | ① | ⅡA | ⅢA | ⅣA | ⅤA | ⅥA | ⅦA | He | |
2 | ② | Be | B | C | N | O | F | Ne | |
3 | Na | Mg | Al | Si | ③ | S | Cl | ④ |